Azo

Marquis of Este, married Parisina, who fell in love with Hugo,
a natural son of Azo. The marquis ordered Hugo to be beheaded; but no
one knows what the fate of Parisina was. Azo, at any rate, married
again, and had a family. This Azo was in reality Niccolo of Ferrara. (
Byron: Parisina.)